Roasting-furnace



(No Model.) 2 Sheets-Sheet 1.

. J. ROGER. ROASTING FURNACE.

No. 523,650. Patented July 24, 1894.

WIT SE5 Tm: ucams #:Ycns' co, Puo'raumo" WASHINGTON n c ('No Model.) 2Sheets-Sheet 2.

J.ROGER. EOASTING FURNACE.

Patented July 24, 1894.

\QV e 3 Hill - VENT 0R ATTORNEY UNITED STATES PATENT OFFICE.

J OHN ROGER, OF DENVER, COLORADO.

ROASTING- FURNACE.

SPECIFICATION forming part of Letters Patent No. 523,650, dated July 2l, 1894.

Application filed May 29, 1893.

To all whom it may concern.-

Be it known that I, JOHN ROGER, a subject of the Queen of Great Britain,residing at Denver, in the county of Arapahoe and State of Colorado,United States of America, have lnvented certain new and usefulImprovements in Roasting-Furnaces; and I do declare the following to bea full, clear, and exact defigures of reference marked thereon, whichform a part of this specification.

My invention relates to improvements in ore-roasting furnaces of theclass shown and described in Letters Patent of the United States No.488,7 97. This style of furnace has an annular hearth to which the oreis fed, and horizontally rotating arms carrying rabbles for manipulatingthe ore and moving it over the hearth from the point of feed to thepoint of discharge.

My improved construction will now be described more in detail andconsists of the features, arrangements and combinations hereinafterdescribed and claimed, all of which will be fully understood byreference to the accompanying drawings, in which is illustrated anembodiment thereof.

In the drawingsz- Figure 1 is a top or plan of an annular furnaceprovided with my improvements. Fig. 2 is a vertical section of thefurnace.

Similar reference characters indicating corresponding parts or elementsof the mechanism in these views, let the numerals 5 and 6 designate theouter and inner circular walls respectively. These walls are connectedby the annular hearth 7 and the arch 8 above. Between the arch and thehearth is the oreroasting chamber into which the hollow rabble arms 9,project through a horizontal slot 10, formed in the inner wall. Theinner extremities of arms 9 are open and received in sockets formed in ahub 10 made fast on the hollow rotatable column 12, the lower extremityof which is provided with a step box 13, suitably supported upon apedestal 14.. The

Serial No. 475.871. (No model.)

upper extremity of this column is journaled to a horizontal cross beam15 by means of a suitable box 16. That part of the column where the hubis attached is provided with openings 12 coinciding as to position withapertures 10 formed in thehub and leading to the open ends of the arms9. This construction allows the air fed from any suitable air forcingapparatus to the hollow column, to pass to the hollow rabble arms 9.

The hub, is provided with spider arms 10 of suitable length which extendradially therefrom and form supports for the arms 9 by means of boxes 10The lower part of these boxes is formed integral with the arms while theupper part is removable and secured to the integral part in any suitablemanner.

To the column 12 is made fast the wheel 17 having a cogged peripheryengaging a fast pinion 18 on the vertical shaft 19 connected with thepower shaft 22 by means of the bevel gears 20 and 21. The gear wheel 17is shown attached to the upper extremity of the column. It is obvioushowever that this wheel may be attached to any other part of the columnas convenience or circumstances may require.

The cross beam 15 to which the vertical col umn is journaled, forms partof the strong horizontal frame work supported upon the outer walls ofthe furnace and suitably braced as shown in Fig.1.

Having thus described my invention, what I claim is In a roastingfurnace of the character described, the combination, with the rabblearms, of the vertical, hollow rotatable column provided with a hubhaving spider arms which afford a support for the rabble arms, the innerextremities of which enter sockets formed in the hub, the column and thehub being apertured to allow the passage of air to the arms,substantially as described.

In testimony whereof I affix my signature in the presence of twowitnesses.

' JOHN ROGER.

Witnesses:

MARY A. WHEELER, W. N. SLITER.

